hehe--you are now an UltraPeer.
You probably won't see much difference in your searches and downloads, but you are now handling the traffic that gets directed to the leaves. Pretty soon you'll see a # of leaves connected. You'll be shielding them from the flood of requests passing through the network.
For fun, turn on the incoming searches in the monitor pane to see the searches flowing through the network. Your machine will pass on those searches to the relevant leaves. You can also doubleclick those searches.
Cool eh?